Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6031789 | Magnetic drive subassembly in a depth control device | Alan Sprain, Louis W. Erath | 2000-02-29 | $5,155,000 |
| 5949214 | Rechargeable battery pack | Alan Sprain | 1999-09-07 | $7,332,000 |